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Question
In the given figure; PQR is a straight line. If: ∠SQR = 75°; find ∠PQS.

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Solution
From given figure,
∠PQS + ∠SQR = 180° [Linear pair of angles]
⇒∠PQS + 75° = 180°
⇒ ∠PQS = 180°- 75°
⇒ ∠PQS = 105°
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